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Jan
13
answered Deformation of an elastic bar
Jan
13
comment Deformation of an elastic bar
For a bar fixed at one end with gravity the deflection would be $s = A \cdot w \ell^4$ where $w$ is the unit weight of the beam (weight/length).
Jan
13
comment Deformation of an elastic bar
If $F$ is gravitational force then it is applied uniformly along the beam and not at the end.
Jan
12
comment Maximum possible acceleration value on a ball in volleyball game
There is a lot going on when a ball impacts something. Have you seen this: youtube.com/watch?v=aMqM13EUSKw
Jan
12
asked Momentum of slowly spinning (viscous) fluid
Jan
10
comment $N$-body simulation in General Relativity
NOTE: Dead link. http://www.photon.at/~werner/light/ returns Forbidden - You don't have permission to access /~werner/light/ on this server.
Jan
9
answered Inertial forces and centre of mass
Jan
8
comment Maximum possible acceleration value on a ball in volleyball game
During impact the velocity changes rapidly over a short period of time. I consider this the max. acceleration condition.
Jan
8
comment Maximum possible acceleration value on a ball in volleyball game
Obviously the maximum acceleration is felt during an impact. Between impact with sand and impact with hand I think the hand would be worst case scenario.
Jan
8
answered How to prove that any rotation can be represented by 3 Euler angles
Jan
6
comment How do I handle elastic contacts in a simulation with friction
My first equation shows the effective mass matrix at the contact point. When you start adding additional connected bodies this shows up in a updated mass matrix. It gets really complicated really fast. Look up Recursive Newton Euler Dynamics. For the basics of dynamic modeling look into (cs.cmu.edu/~baraff/sigcourse/notesd1.pdf) and (cs.cmu.edu/~baraff/sigcourse/notesd2.pdf)
Jan
6
comment Orbital mechanics: will a satellite crash?
You using $e$ and $\epsilon$ above. To avoid confusing you should use one or the other but not both.
Jan
6
answered moment of inertia when a shape is cut
Jan
6
comment How do I handle elastic contacts in a simulation with friction
If you re-word the question such as "How do I handle elastic contacts in a simulation when friction is present.." and explain "For example, a disk a dropped .." then you can petition to re-open the question (if you want to). Maybe other responses would be of value to you.
Jan
6
comment Expressing angular velocity of solid body
Transform $\omega$ from world to local coordinates with $E^\intercal \vec{\omega}$
Jan
6
answered Expressing angular velocity of solid body
Jan
6
comment How do I handle elastic contacts in a simulation with friction
Draw a diagram with the disk in contact, the impulse components and do (net impulse) = (mass) ( change in linear speed of center) and (net impulse moment about center) = (mass moment of inertia) (change in angular speed)
Jan
6
revised How do I handle elastic contacts in a simulation with friction
added 191 characters in body
Jan
6
comment How do I handle elastic contacts in a simulation with friction
Remove the code listing. It confuses things. To ask about code post to Stack Overflow. You are asking about a physics concept, right? Stick to asking with equations and only mention that this goes into a simulation in passing.
Jan
6
answered How do I handle elastic contacts in a simulation with friction